Google updated the Android 4.2 Jelly Bean changelog to highlight everything that is new in the latest version of software available for Android smartphones and tablets. While users have been familiar with marquee additions like Photo Sphere and a brand new camera application with HDR mode, dozens of other features have been added to Android. Google has updated it's Android Jelly Bean changelog to highlight all of the improvements made. The complete list of all Jelly Bean features is available at this link, but here is a list showing only what was added in the Android 4.2 update.

Camera- Android 4.2 features a completely redesigned camera app with new tools for taking photos.
- High Dynamic Range or HDR mode (on supported devices) lets you see more detail in your shots by widening the exposure range.
- A brand new photo editor features new filters, borders, and other tools to easily customize your photos.
- With Photo Sphere you can take immersive 360º images and wide angle shots that you can view and share on your phone, tablet or desktop computer.
- Access camera straight from your phone's lock screen.

Clock- The clock has been totally redesigned with an all new look which includes both a digital and analog clock style.
- You can use the new stopwatch to track time, count laps and splits, and share your times.
- You can use the new timer to keep track of predetermined periods of time, run multiple timers at once, and even label your timers.
- The world clock lets you check the time in different cities right from the Clock app or your lock screen.
- New clock widgets let you choose from an analog or digital clock widget. You can also resize the digital clock widget to display the time in other cities around the world.

Accessibility- Triple tap to enter full screen magnification when you enable 'Magnification gestures'.
- Enable 'TalkBack', a screenreader for Android, right from the power menu.
Graphics
ew Triple tap to enter full screen magnification when you enable 'Magnification gestures'.
- Enable 'TalkBack', a screenreader for Android, right from the power menu.
Internationalization
- Android 4.2 brings improved font positioning, glyph cache performance, and more accurate placement of accents in Indic, Hebrew, Arabic, Thai and Latin font kerning.
- New fonts have been added including Roboto Thin and Nanum Gothic for improved Korean font quality.
Keyboard
- Android 4.2 introduces an all new Gesture Keyboard that lets you glide over letters to type a word while it dynamically predicts what you want to type.
- French, English and Russian dictionaries are even more accurate and relevant, while new dictionaries have been added in Danish, Greek, Finnish, Lithuanian, Latvian, Polish, Slovenian, Serbian, Swedish and Turkish.
Lock Screen
- Android 4.2 lets you place widgets on your device's lock screen to give you faster access to your calendar, Gmail, SMS messages, and even third party app widgets.
- Quickly launch Google Now by swiping up from the bottom edge of your secure lock screen.
- Easily access camera straight from your phone's lock screen.
Messaging and Talk
- Support for group messaging via MMS.
Networking
- Wi-Fi Direct support has been improved, so your device can now remember other devices.
- Faster captive portal detection on Wi-Fi, cellular connections, and pay-as-you-go SIMs.
Phone
- Wi-Fi Direct support has been improved, so your device can now remember other devices.
- Faster captive portal detection on Wi-Fi, cellular connections, and pay-as-you-go SIMs.

Settings- Access Settings by tapping the Quick Settings icon in the notification shade, or swipe down from the top right on tablets or with two fingers on phones to access settings.
- Now quickly toggle Wi-Fi and Bluetooth with a long press in Quick Settings.
System
- New 10-inch tablet UI which lets you quickly access your favorite apps from any homescreen and gives improved access to your notifications.
- New multi-user support for tablets lets different users have their own separate, customizable spaces on a single device.
- Tablets can now support up to eight users. Three users can be active at a time, and they can all sync data like email at the same time and even reuse apps if another user has them installed.
- A new display mode 'Daydream' allows apps to display interactive screensavers - like a photo album or a Currents stream when your tablet or phone isn't being used.
- App permissions are now clearer and more intuitive.
- Android 4.2 introduces a new app verification service (for devices that have Google Play installed) that provides enhanced security along with always-on VPN.
- You'll now receive a warning before an app tries to send SMS messages that may cost you money.
- Improved security for devices with debugging enabled - you can enable debugging for each new debugging client.

Google Search- Voice Search lets you launch apps, add meetings to your calendar or even find out when your next appointment is.
Google Now
- Hotel card: Get one-touch navigation to your hotel when you arrive in a - city.
- Restaurant reservation card: Be reminded to leave for the restaurant based on live traffic information.
- Event card: Get reminders about events you purchased a ticket for.
- Package card: See when your online orders ship.
- Next appointment card: When you have an appointment, Google Now checks traffic so you can know how long it'll take to get there. You even get a notification for when you should leave.
- Movies card: See showtimes and ratings for what's playing when you're near a theater. Also be notified when a movie you're interested in arrives at theaters.
- Concerts card: See when your favorite artists have concerts at nearby venues.
- Stocks card: Get real-time information about stocks you track.
- Public alerts card: Receive emergency messages such as storm warnings and earthquake alerts.
- Developing story & breaking news card: See breaking news and other developing stories that match your interests.
- Nearby attractions card: See what nearby attractions are popular to visit.
- Nearby photo spots card: Learn of popular photo spots nearby.
- Time at home card: When you're in a different time zone, Google Now shows you the time at home so you never feel too far away.

Google Apps- Calendar can now be displayed as a widget on phone and tablet lock screens.
- Calendar now auto completes when entering event titles.
- New Google Feedback integration lets you give Google feedback and improve Calendar.
- Gmail now auto-fits messages to your screen and lets you pinch-to-zoom, so emails are easier than ever to read.
- You can now swipe to archive or delete emails when viewing your Gmail inbox.
- When composing a message, you can attach videos right from Gmail.
- When you receive an email with photos attached, Gmail gives you larger photo previews and a gallery view so you can enjoy the photos more quickly and easily.
- Upload your Photo Spheres to Google Maps directly from your phone, so others can experience them on their desktop.
- You can share Photo Spheres with your circles or publicly, and anyone you share with can experience them on Google+ on their desktop.
- Photo Spheres are now also saved in Instant Upload.
- Chrome is the standard browser on Nexus 4, Nexus 7 and Nexus 10.
- You can discover new music in Google Play by touching 'explore similar artists' and swiping between artists to instantly listen to previews of their music.
- You can now buy Movies and TV Shows and access your library from Google TV.